Two reasons. The first is the obvious one: the heritage brands are usually better made. Johnstons of Elgin has been spinning cashmere on the same River Lossie site since 1797; Lyle & Scott's Hawick knitwear factory ran from 1874 until 2010; House of Bruar has been the tweed-and- knitwear destination of the Highlands since 1995. The quality difference between a Johnstons cashmere and a high-street equivalent is large enough to justify the price differential almost regardless of the specific item.
The second is the texture of the trip. Wearing a Lyle & Scott Eagle Crew at Royal Dornoch is a small thing. It also feels like a more honest version of the trip than wearing the same Nike polo you wear at the country club at home. The local knitwear, the heritage tweed, the proper wool socks — they make the photographs look right and they feel right under the conditions the courses were built for.
Each cluster article walks through one brand's provenance, the items worth knowing, the price points, and where to actually buy in 2026 (the brands' own sites, the better stockists, and the affiliate routes where they exist).